do they need to put a reverse dish on the wheel? Just looks like there is an offset spoke drilling ont he rim, and the rohloff has no offset?

It's to address the 100mm wide BB on the Pugsley. The rim stays centered on the frame, but the hub is offset 18mm to the drive side to align the cog with the crank. That's Surly's solution to prevent having to run a ridiculously wide hub.